Preparation for provincial examination: Baihetan Hydropower Station, the largest hydropower station under construction in the world.

Baihetan Hydropower Station is located in ningnan county, Liangshan Prefecture, Sichuan Province and Qiaojia County, Zhaotong City, Yunnan Province. It is the second cascade hydropower station developed in the lower reaches of Jinsha River. It has comprehensive benefits such as power generation, flood control, sand blocking, improving downstream shipping conditions and developing shipping in the reservoir area. The development task of Baihetan Hydropower Station is to give priority to power generation, give consideration to flood control, promote local economic and social development and help immigrants get rid of poverty and become rich.

As the world's first hydropower station with a single unit capacity of one million kilowatts, Baihetan has created a number of firsts, including a single unit capacity of 6,543.8+0,000 kilowatts, the scale of cylindrical tailrace surge shaft, the scale of underground cavern, and the seismic parameters of 300-meter high dam. The 300-meter-class ultra-high arch dam adopts low-heat cement concrete for the first time, and the scale of pressureless spillway tunnel ranks first in the world.

The normal water level of the reservoir is 825 meters, with a corresponding storage capacity of 20.6 billion cubic meters. The underground workshop is equipped with 16 units. The initial planned installed capacity is160,000 kilowatts, and the average power generation for many years is 60.24 billion kwh. The main project of the power station is scheduled to start in 20 13, the first batch of units will generate electricity on June 28th, 200210, and the project will be completed in 2022. Baihetan Hydropower Station is a Class I (1) project. The hub project consists of barrage, flood discharge and energy dissipation facilities, water diversion and power generation system and other major buildings. The barrage is a concrete hyperbolic arch dam with a crest elevation of 834m, a maximum dam height of 289m, a vault thickness of 14.0m, a maximum arch end thickness of 83.9 1m, and a maximum extended foundation. . The arch at the top of the dam is about 209.0m long and is divided into 30 transverse joints and ***3 1 dam section. Concrete cushion seats shall be set at the elevation above 750.0m, enlarged foundations shall be set at the bottom of dam sections 4 # ~ 25 #, and no longitudinal joints shall be set for the dam. The dam consists of plunge pool and Erdaoba, and the flood discharge facilities include 6 surface holes, 7 deep holes and 3 flood discharge tunnels on the left bank of the dam. The underground powerhouse is symmetrically arranged on the left and right banks, and the tailrace system consists of two units and a tailrace tunnel. There are four tailrace tunnels on the left bank and the right bank, three of which are combined with the left bank diversion tunnel and two with the right bank diversion tunnel. Zuo 'an 1 generator set is developed by Sichuan Dongfang Electric, and its rated efficiency is over 99%, making it the most efficient generator in the world.

After the completion of the project, there will be comprehensive utilization benefits such as blocking sand, developing navigation in the reservoir area and improving navigation conditions in the downstream, right? Power transmission from west to east? One of the main power points of. After completion, it will mainly supply power to East China Power Grid, Central China Power Grid and China Southern Power Grid, taking into account the electricity demand of local power grids. At the same time, it can increase the annual power generation of downstream cascade hydropower stations such as Xiluodu, Xiangjiaba, Three Gorges and Gezhouba by 2.43 billion kilowatts? H, and can increase the downstream cascade power generation in dry season (12 ~ may) by 921100,000 kW? H, obviously improve the power quality of each downstream cascade, and generate huge benefits.

The construction and development of Baihetan Hydropower Station will bring good opportunities for the social and economic development of the reservoir area, and the traffic and infrastructure construction of the reservoir area will be greatly improved, which will promote the development of related industries and will certainly play a positive role in the social and economic development of the region. At the same time, the construction of this project will promote the development of the western region and realize? Power transmission from west to east? It is of far-reaching significance to promote the complementary advantages of western resources and eastern and central economies and the economic development of the western region.

Test center analysis:

The first batch of units of Baihetan Hydropower Station was put into production in June this year, and it is expected that all units will be put into production before July 2022. As far as current affairs are concerned, our country has the largest hydropower station in the world, the Three Gorges Hydropower Station and Baihetan Hydropower Station, which are the largest hydropower stations under construction in the world and one of the largest infrastructure projects in our country in recent years. In the common sense of geography, the location of Baihetan Hydropower Station in China and why it was chosen here may be reflected in the examination questions; In the common sense of science and technology, the basic principle of hydropower station is to use the water level difference and cooperate with the hydro-generator to generate electricity, that is, to convert the potential energy of water into the mechanical energy of the hydro-generator, and then use the mechanical energy to drive the generator to obtain electricity. Taking advantage of this natural condition of water level difference, scientists effectively use fluid engineering and mechanical physics to achieve the highest power generation and let people use cheap and pollution-free electricity. Therefore, the comprehensive political science and geographical analysis is still very challenging.

Simulation questions

The following hydropower stations are the largest under construction in the world? (? )

A. Three Gorges Hydropower Station

B. Xiluodu Hydropower Station

C. Xiangjiaba Hydropower Station

D. Baihetan Hydropower Station

Answer d

Baihetan Hydropower Station is located in ningnan county, Liangshan Prefecture, Sichuan Province and Qiaojia County, Zhaotong City, Yunnan Province. This is the second cascade hydropower station developed in the lower reaches of Jinsha River. It is the largest hydropower station under construction in the world, with comprehensive benefits such as power generation, flood control, sand interception, improvement of downstream shipping conditions and development of shipping in reservoir areas.